I've also seen it geotag things based upon the content of the image alone. I went to the photo store not long ago and had dozens of rolls of negatives scanned,

I've also seen it geotag things based upon the content of the image alone. I went to the photo store not long ago and had dozens of rolls of negatives scanned, from a vacation to Europe 20 years ago. I uploaded them into Google Photos and it geotagged many of them automatically. They have a public API that does the same, it detects landmarks in images and can give you a lat/long position for it as well as a confidence score. https://cloud.google.com/vision/docs/detecting-landmarks https://cloud.google.com/vision/docs/detecting-landmarks